A035025 Constant term of (normalized Delta)^(-n).

24, 1224, 70080, 4225320, 262350144, 16601086656, 1064505632256, 68930439949800, 4497211032959040, 295166841587267904, 19466935185947613696, 1289057050529747464896, 85647693620610353594880

Offset

1,1

Comments

Normalized Delta generates Ramanujan tau function.

Links

Table of n, a(n) for n=1..13.

B. Brent, Quadratic Minima and Modular Forms, Experimental Mathematics, v.7 no.3, 257-274.

Example

(\tau(1)q+\tau(2)q^2+...)^(-1)=q^(-1)+24+...

Mathematica

a[n_] := (delta = Series[ q*Product[ (1-q^k)^24, {k, 1, n}] , {q, 0, n+1}]; SeriesCoefficient[ Series[ delta^-n, {q, 0, 0}], 0]); Table[a[n], {n, 1, 13}] (* Jean-François Alcover, Feb 20 2012 *)

Crossrefs

Sequence in context: A042107 A042104 A069991 * A074652 A367706 A188807

Adjacent sequences: A035022 A035023 A035024 * A035026 A035027 A035028

Keyword

easy,nice,nonn

Author

Barry Brent (barryb(AT)primenet.com)

Status

approved